Adjustable sieve.



f PATENTED DEC. l-'7, 1907. 0. CLOSZ.

ADJUSTABLE SIEVE. 1 -.121 L10AT10N` FILED JAN. 1a. 190e.

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No. 873,719. PATENTED DEC. 17. 1907.

G. GLosz. f

`ADJUS'ILIBLE SIEVE.

APPLICATION FILED JAN.13, 1906.

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UNTTF CHARLES CLOSZ, OF WEBSTER CITY, IOWA.

ADJUSTABLE SIEVE.

Specification of Letters Patent.

Patented Dec. 1'7, 1907'.

Application filed January 13, 1906. Serial No. 295.871.

T0 all whom it may concern:

Be it known that 1, CHARLES CLosz, a citi- Zen of the United States,residing at Webster City, in the county of Hamilton and State of Iowa,have invented certain new and useful Improvements in Adjustable Sieves;and 1 do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

My present invention relates to that class of adjustable sieves that aremade up of overlapped sheet metal sections, and has for its object toimprove the same in the several particulars hereinafter noted. A sieveof the general character above indicated is disclosed in my prior patent1# 698,258, of date April 22, 1902.

The sieve herein illustrated and claimed is especially adapted, undercertain adjustments, to separate wheat and other grains from chaff,short straws, white-caps and so forth, and, under other adjustments, toseparate small seeds, like timothy seeds, from heads, husks and brokenstems, etc.

The invention is illustrated in the accompanying drawings, wherein likecharacters indicate like parts throughout the several views.

Figure 1 is a plan view, with some parts broken away, showing a sieveembodying the features of my invention. Fig. 2 is a section taken on theline .732 cc2 of Fig. 1. Fig. 3 is a plan view, showing in detail one ofthe slats or sections of the sieve, some parts being broken away. Fig. 4is a rear elevation of the slats shown in Fig. 3. Fig. 5 is a detailtaken in section on the line @c5 @c5 of Fig. 3; Fig. 6 is a detail takenin section on the line ic 0c of Fig. 3, and Fig. 7 is an enlarged detailtaken through one of the slats on the line or? of Fig. 1.

The numeral 1 indicates a rectangular supporting frame of the sieve, thesame, as shown, having a central bar 1a. The nu-V meral 2 indicates, asan entirety, the metallic slats or sections of the sieve, which sectionsare secured to rock shafts 3, are suitably mounted in the sides of saidframe, and are provided with U-shaped cranks 4 at their centralportions. A push bar 5 pivotally connects the cranks 4, and is itselfconnected to a link 6.

The numeral 7 indicates an adjusting rod which is mounted for rotary andsliding movements in a block 8 on one side of the sieve frame 1, and isprovided, at its inner end, with a back-turned crank 9 that workspivotally and slidably within the free end of the link 6. At its outerend, the adjusting rod 7 is provided with a hand piece 10 and with abeveled retaining lug 11, which latter coperates with a notchedretaining ring 12 secured on the block 8, to hold the adjusting rod 7 inany position in which it may be set, and hence, the sieve sections inany position in which they may be set. A coiled spring 13 on the rod 7,reacts against one side of the frame 1 and against a washer 14 securedon said rod, to normally hold the lug 11 engaged with the teeth of theretaining ring 12.

Thev slats 2 extend transversely of the line of travel of the stock, andare corrugated, and between the ribs of the corrugation, are formed withdiverging notches 2a that extend from their front edges back preferablymore than half way to the axes of the respective rock shafts 3. 1t willbe noted that the notches 2a flare in a direction toward the forwardedges of the slats at one angle to the points marked 2b, and that theyflare with an increased angle of divergency from said points 2b to theforward edges of the said slats. This is done for an important purposewhich will hereinafter appear. The finger portions formed between thenotches 2a are rounded upward in cross-section, but in the direction ofthe travel of the stock, their upper portions extend on straight lines.Furthermore, the iingers of the several sections or slats are alined inthe direction of the travel of the stock, so that they form aplu ralityof approximately continuous ridges, with intervening channels, and withthe notches 2EL lying within said channels.

Those portions of the slats 2 that extend rearward of the respectiverock shafts, are imperforate, and are bent downward at an angle withrespect to the planes of the corresponding 'finger portions. To thefront and rear transverse bars of the frame 1 are rigidly secured othermetallic slats 15 and 16 respectively, the former of which has noiingers or notches, and the latter of which is provided with Jlingersand notches of the character already indicated.

1n this application, as in the companion application filed of even dateherewith, and entitled Adjustable sieves, the notchesI 2a of theoverlapping slats 2 extend backward beyond or rearward of the rear edgesof the slats which they overlap, so that the grain or seed may freelyfall directly and vertically through the sieve openings affordedthereby. This feature is, however, broadly claimed in my said companionapplication.

As will be seen by reference particularly to Fig. 5, the rearwardlyinclined'portions of the slats are also corrugated. It is important hereto note that the said rearwardly inclined portions of said slats areformed with secondary or intermediate dividing ribs or ridges 17 whichrise within the channels of the corrugations and, as shown, run out atthe tops of the ridges or highest portions of said corrugations. In thispreferred construction, these dividing ridges 17, it will be noted,extend or lie immediately below the points marked 2b, to-wit, the pointswhere the greatest divergency of the notches 2a begins. Immediately overthe rock shafts 3, where the forwardly and rearwardly eX- tendedportions of the slats meet, at an angle, is a main or primary dividingridge 18.

By reference particularly to Fig. 7, it will be noted that the rearportions of the slats, just at the rear of the so-called secondarydividing ridges 17, are formed with depressions 17a which leave raisedribs or abutments 17b at the eXtreme rear edges of the said slats.

When the sieve is to be used for the separation of wheat from chaff andother foreign material, it should be adjusted substantially as shown bydotted lines in Fig. 2. When the sections are thus adjusted, the rearportions of said sections, and the dividing ridges 17 thereof, it willbe turned downward so far that the line of division between the materialwhich will be moved forward and that which will drop rearward, will beat the primary dividing ridge 18. It will, of course, be understood thatthe forward movement of the stock over the sieve, when the latter isplaced within a separator or threshing machine, will be due partly to anair blast and partly to the propelling action of the sieve surface.

When the fingers of the sieve sections or slats are turned upward, asjust described, the entire portions of the notches 2a are caused to actas sieve meshes or passages, so that it will be seen that under thisadjustment, long and wide sieve meshes or passages are provided. At thesame time, in view of the increased divergency of the outer portions ofthe notches, the channels formed between the fingers or ridges are madewider than if less divergency were given to the said notches.

For the separation of small seeds, such as timothy seed, from stocks,husks and other foreign materials, a narrower and shorter sieve openingor mesh than those provided for the separations or adjustments of thesieve sections above described, is required.

This is provided when the fingers of the sieve sections are turned intohorizontal, or approXimately horizontal, positions, or in other words,into the plane of the sieve surface. Under this adjustment, the rearportions of the sieve sections are turned upward, and the ridges 17 areraised to such an extent that they will make the dividing line betweenthe material which is to be forced forward, by the air blast and themovement of the sieve, and that which will fall through the sieve, underthe action of gravity.

It is further very important to note that when the sieve is thusadjusted for the separation of timothy seed, aX, or other small seed,the third ribs or so-called abutments 17b are raised into such positionthat any small stems, sticks or small pieces of weed falling thereonwill be caught or retarded in their downward movement, or in otherwords, held, so that the air blast passing upward through the meshes ofthe sieve will catch and carry the same upward and forward through thesaid meshes or openings, and hence upward and onto the upper surfaces ofthe sieve.

It will now be seen when the sieve sections are closed up or turned withtheir fingers nearly or quite in horizontal positions, sieve openings ormeshes are provided in the rear portions of the notches 2a, rearward ofthe ridges 17, and that these openings are not only shorter, butnarrower, than thosepprovided when the sieve is adjusted as shown bydotted lines in Fig. 2.

What I claim and desire to secure by Letgers Patent of the United Statesis as folows:

1. A sieve made up of a plurality of overlapping slats having, at theiroverlapping forward edges, finger portions and intervening notches, andwhich slats, at their intermediate portions, in line with said notches,are formed with primary and secondary dividing ridges, said secondaryridges being located below the intermediate portions of the overlyingnotches of the overlapping slats, substantially as described.

2. A sieve made up of a plurality of adjustable overlapped slats having,at their overlapping forward edges, longitudinally alined raised fingerportions and longitudinally alined intervening notches, and which slats,vat their intermediate portions, in line with said notches, are formedwith primary and secondary dividing ridges, said secondary ridges beinglocated below the intermediate portions of the overlying notches ofoverlapping slats, substantially as described.

8. A sieve made up of a plurality of overla ped slats having, at theiroverlapping rear edges, finger portions and intervening notches andhaving, at their intermediate portions, primary and secondary dividingridges, said secondary dividing ridges being located below theintermediate portions of the overlying notches of overlapping slats, thesaid slats further having, at the rear of the said secondary dividingridges, raised abutments or ribs, substantially as described.

4. A sieve made up of a plurality of adjustable overlapped slats,having, at their overlapping forward edges, longitudinally alined raisedfinger portions and longitudinally alined intervening notches, andhaving, at their intermediate portions, in line with said notches,primary and secondary dividing ridges, said secondary ridges beinglocated below the intermediate portions of the overlying notches ofoverlapping slats, said slats further having at the rear of saidsecondary ridges, raised abutments or ridges, substantially asdescribed.

5. A sieve made up of a plurality of adjustable slats having in theiroverlapping forward edges notches that diverge in a forwardly direction,at one angle from their rear to their intermediate portions and at anincreased angle from their intermediate to intermediate of their pivotsand rear edge portions, substantially as described.

6. A sieve Vmade up of a plurality of pivotally adjustable overlappedslats having in their overlying forward edges diverging notches, thedivergency of which increase from the intermediate to the end portionsthereof, and the overlapped edge portions of said slats being inclinedand formed with two transverse dividing ridges, the one located belowthe forward extremities of said diverging notches and the other locatedbelow the points where varying angles of the divergency of the notchesintersect, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES CLOSZ.

Witnesses:

MALIE HOLL, F. D. MERCHANT.

